Seeking input to access originality of YH Wheels

[Z4Life]

I have been searching for a full set of YH date correct wheels for my Z-28 for a couple of years. I came across this pair (2) so bought them on the spot fearing they wouldnt stick around long. I would like to get some input from the experts about their originality. Additional stampings include the 15 x 7 JJ stamp on the barrel and the K 1 9 stamp near the center of face as well. I know a lot of parts get restamped/fakes of originals produced. Is that the case with these?   If anyone has a known original set of K 1 9  8 hole 4 wheels it would be revealing to compare stampings.
I appreciate any and all input. If there are any specific features that would help identify original YH wheels just ask or PM me and I will take more pictures to share.
Thanks

[GMAD_Van Nuys]

Previous CRG posting on YH wheels:

http://www.camaros.org/forum/index.php?topic=18723.0

[Z4Life]

Thanks for the link.  6 weeks to 2 months prior to production seems to be the norm based on what I have read.  From other posts and discussions with Legend Judge a 69 09C production came with 08 04 dated wheels.  What I am seeking to determine is if these are restamps or originals. 

[luv2sixty9]

They appear to look original and have the larger window opening for Sept YH they went to the smaller windows.

They also have the same date as the misc. pair I have in the basement.

[luv2sixty9]

Here are some pics of the stamping as requested. Thanxs Dave

[luv2sixty9]

Additional pics

[Z4Life]

Thanks for the pictures Dave.  The font looks the same to me, spacing on the stamping look consistent/the same.  Looks like a match to me.  Anyone else care to comment?